Underworld (also known as Raids) is the multiplayer mode of Shadow Fight 2. It features online raid-style battles which allow players to team up together with other players to defeat the bosses. The bosses, called the Eternals, are powerful beings that have lived for thousands of years and they started their aim to destroy the world after the Gates of Shadows are opened. Playing Underworld is completely optional. Players can enter it anytime after they defeat Needle, Lynx's second bodyguard(Brick).